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Ultrasonic Dog Training & Personal Alarm System is primarily a training device, but includes additional security features for the user. With the push of a button it releases a corrective ultrasonic siren that is immediately audible to dogs and will distract them from what they were doing, allowing you to direct on site training by repeated use when the pet is performing an unwanted act. Built-in flashlight for nighttime use. Wrist strap and belt clip is included. Can also be used as a personal alarm. Operates on one 9-Volt battery (not included)